diff --git a/52.md b/52.md
index cc2625af..f701ca6f 100644
--- a/52.md
+++ b/52.md
@@ -25,7 +25,7 @@ The format uses an _addressable event_ of `kind:31922`.
 The `.content` of these events should be a detailed description of the calendar event. It is required but can be an empty string.
 
 The list of tags are as follows:
-* `d` (required) universally unique identifier (UUID). Generated by the client creating the calendar event.
+* `d` (required) a short unique string identifier. Generated by the client creating the calendar event.
 * `title` (required) title of the calendar event
 * `start` (required) inclusive start date in ISO 8601 format (YYYY-MM-DD). Must be less than `end`, if it exists.
 * `end` (optional) exclusive end date in ISO 8601 format (YYYY-MM-DD). If omitted, the calendar event ends on the same date as `start`.
@@ -46,7 +46,7 @@ The following tags are deprecated:
   "kind": 31922,
   "content": "<description of calendar event>",
   "tags": [
-    ["d", "<UUID>"],
+    ["d", "<random-identifier>"],
 
     ["title", "<title of calendar event>"],
 
@@ -84,7 +84,7 @@ The format uses an _addressable event_ kind `31923`.
 The `.content` of these events should be a detailed description of the calendar event. It is required but can be an empty string.
 
 The list of tags are as follows:
-* `d` (required) universally unique identifier (UUID). Generated by the client creating the calendar event.
+* `d` (required) a short unique string identifier. Generated by the client creating the calendar event.
 * `title` (required) title of the calendar event
 * `start` (required) inclusive start Unix timestamp in seconds. Must be less than `end`, if it exists.
 * `end` (optional) exclusive end Unix timestamp in seconds. If omitted, the calendar event ends instantaneously.
@@ -110,7 +110,7 @@ The following tags are deprecated:
   "kind": 31923,
   "content": "<description of calendar event>",
   "tags": [
-    ["d", "<UUID>"],
+    ["d", "<random-identifier>"],
 
     ["title", "<title of calendar event>"],
     ["summary", "<brief description of the calendar event>"],
@@ -167,7 +167,7 @@ The format uses a custom replaceable list of kind `31924` with a list of tags as
   "kind": 31924,
   "content": "<description of calendar>",
   "tags": [
-    ["d", "<UUID>"],
+    ["d", "<random-identifier>"],
     ["title", "<calendar title>"],
     ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional relay url>"],
     ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional relay url>"]
@@ -215,7 +215,7 @@ The list of tags are as follows:
   "tags": [
     ["e", "<kind 31922 or 31923 event id", "<optional recommended relay URL>"]
     ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional recommended relay URL>"],
-    ["d", "<UUID>"],
+    ["d", "<random-identifier>"],
     ["status", "<accepted/declined/tentative>"],
     ["fb", "<free/busy>"],
     ["p", "<hex pubkey of kind 31922 or 31923 event>", "<optional recommended relay URL>"]